Vacuum cleaner



FIG. 1 is a top, front and side perspective view of a vacuum cleaner according to the present design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIGS. 6 and 7 are right and left side elevational views thereof, respectively. 

The ornamental design for a vacuum cleaner, as shown and described. 